Dakota County officials arrested four individuals in connection with a marijuana grow operation in cities throughout Dakota and Scott Counties. Thi An Mac, 31, of Burnsville; Nghia Hoang Nguyen, 31, of St. Paul; Trang Uyen Mac, 35, of Burnsville, and Trung Van Nguyen, 39, of Apple Valley, were charged each with one count of conspiracy to commit controlled substance crime in the second and third degree.